However, it helps ensure SSDs do not get completely full, keeping speeds at a more acceptable level. Many drive manufacturers add extra storage to each drive that is not available to the user to prevent Solid-State Drives from degrading performance. The only caveat is that the entire process takes time, and repeating the process on many blocks dramatically reduces speeds, affecting performance. The solution to this problem is a write operation that loads the data inside a block into the cache, modifies its content adding the new data, and then writes pages back to the block. The problem is that SSDs cannot use the leftover space in a block to write new data directly because it would actually destroy any data already on it. NAND flash memory example by Dmitry Nosachev As you continue to store data and storage fills up, the drive will begin to run out of blocks, and because Solid-State Drives can only write data in pages of 4KB or 8KB inside of a 256KB block, you end with blocks that are not completely filled.
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